<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }



        div {
            position: relative;
            width: 1250px;
            margin: auto;
            text-align: center;
        }

        img {
            display: block;
            width: 100%;
        }

        .chouka {
            position: absolute;
            width: 187px;
            height: 49px;
            opacity: 0;
            bottom: 22px;
            right: 54px;
            float: left;
            border: 0;
            background-color: rgb(251, 251, 251);
        }

        .qiehuan1 {
            position: absolute;

            width: 103px;
            height: 39px;
            opacity: 0;
            top: 22px;
            left: 447px;
            float: left;
            border: 0;
            border-radius: 3px;
            background-color: rgb(76, 108, 149);

        }

        .qiehuan2 {
            position: absolute;
            width: 115px;
            height: 43px;
            opacity: 0;
            top: 20px;
            right: 441px;
            float: left;
            border: 0;
            border-radius: 5px;

            background-color: rgb(247, 243, 215);
        }

        button:hover {
            opacity: 0.2;
            border: 1px 0 1px 0;
        }

        .chouka:active {
            bottom: 20px;
        }

        .qiehuan1:active {
            top: 23px;
        }

        .qiehuan2:active {
            top: 22px;
        }
    </style>

</head>

<body>
    <div>
        <img src="img/choukajiemian2.png" alt="">
        <button class="qiehuan1" id="btn1">
        </button>
        <button class="qiehuan2" id="btn2">
        </button>
        <button class="chouka" id="btn3">
        </button>
    </div>

    <script>
        var btn3 = document.getElementById('btn3');
        var btn1 = document.getElementById('btn1');
        var num = 1;
        btn1.onclick = btn2.onclick = function qiehuan() {
            var str = "choukajiemian" + num + ".html";
            location.href = str;
        }
    </script>
    <script src="myjs/chouka.js"></script>

</body>

</html>